Improvement in hot-air furnaces



" JOHN'R. BAKKER. v

Hot-Air Furnace.

" Patented May28,18v72.

UNITED ASTATES JOHN E. BAEKER, OE CHICAGO, ILLINOIS.

IMPRQVEMENT IN HOT-AIR FURIIACES.

Specication forming part of Letters Patent No. 127,140, dated MayQS, 1872.

SPECIFICATION.

To all whom "it may concern:

Be it known that I, JOHN R. BARKEE, of Chicago, in the county of (look and State of Illinois, have invented certain Improvements in Heating-Furnace, of which the following is a specification, reference being had to the accompanyin g drawin 0'. Y

My invention relates to hot-air furnaces; and consists ini the novel construction and arrangement of the air and smoke lines in connection with the fire-pot and vaporpan.

In the drawing, Figure l is a cross-vertical section on the line y y of Fig. 3. Fig. 2 is a cross-vertical section on the line z z of Fig. 4..l Fig. 3 is a cross-horizontal section on the line o o of Fig. l 5 and Fig. 4 isa cross-horizontal section on the line .r of Fig. 2.

In constructing my furnace I make a base, E, with an open bottom, and from the periphf ery of which a shell of mason work, A, or other suitable material is built, so as to inclose and leave an air-space, B, between it and the body of the furnace, as is clearly shown in all the figures. Upon the base is placed an ashpit,

.F, with its opening arranged as shown, and

over the ash-pit a fire-pot, G. This fire-pot is provided on its exterior with a series of radiallyprojecting flanges or ribs, a, having an offset or shoulder, b, near their lower ends, as shown clearly in Figs. l and `2. Around the lower ends of the flanges a and just below the shoulders b, is placed an annular vapor-pan, c, as shown in the same figures. Above the vaporpan c, and resting upon the shoulders b of the fire-pot, is an annular drum, H, from the upper side of which are a series of flues, d, connecting it with the open space in the head of a cylinder, I, abovethe fire-pot. These iiues d are return-lines to carry the smoke and draught from the iirepot down to the drum, from which they pass out into the smoke-pipe J, as clearly shown in Fig. 1. The body of the cylinder I is suliiciently smaller in diameter than its head to be placed within the circle of the returnues d, and is( of the proper length to extend alittle below the upper end of the repot, and in diameter is larger than the repot. Its lower end is provided with a ring,

f, the inner side-of whichl lits close about the upper end of the pot. Within the cylinder I are arranged a series of air-flues, e, the lower ends of which open into the spaces above the anges a, and their upper ends into the air-space above the body of the furnace, between it and its outer shell.` From the upper end of the cylinder I is a pipe, K, connecting it with the smoke-pipe J, and in which is placed a damper, g, in order that the draught may be direct when desired, instead of through the return-dues. For the removal of the dirt, dust, 8vo., from the drum H, an opening, M, is provided, with a movable plate, h, and for cleanin gl the smoke-pipe and obtaining access to the damper, a removable section, N, is provided, all as shown in Figs. 1 and 2. The ordinary dumping-grate may be used, and the usual access for introducing the fuel provided.

The operation of this furnace willbe readily seen. When the lire is kindled, and the water introduced into the vapor-pan by any suitable device, the smoke and draught will pass to the upper end of the cylinder I, then down in to the drum H, and then on out through the smoke-pipe, heating thoroughly in the mean time the lire-pot and its flanges lor ribs, the cylinder, smoke-flues, and drum, all of which radiate heat into the space between the body of the furnace and its shell. At the same time a current of cold airis coming in through the 4 base of the furnace, and passing np between the anges or ribs a and the drum H, and on up through the air-dues e, and out through their upper ends, becoming in its passage thoroughly heated. While this is going onthe water in the pan o is being evaporated, and the vapor is mingling with the cold airas it passes up between the anges or ribs on the fire-pot and the drum II. The air thus heated and moistened is then ca-rried off into the building in the usual manner.

A furnace thus constructed furnishes an unusually large amount of heating and radiating surfaces. The iian ges upon the fire-pot as well as the pot itself are, of course, heated the most, and it will be noticed they are so arranged that thecold air comes immediately in contact with them ou entering the furnace, and

is-k'ept in close Contact with surfaces that are directly heated by the re unt-i1 it escapes: out of the upper end of the body of the furnace. The vapor-pan, too, ib will be seen, is so constructed as to afford a large evapora-ting surface, and is so arranged that the vapor is introduced into the air uniformly as it enters the furnace.

Having thus described my invention7 what I claim is- A hot-air furnace, consisting of the ribbed fire-pot G, drum H, ring f, ues d and e, and annular vapor-pan c, when constructed and arranged to operate substantially as herein described. l

JOHN R. BARKER.

Witnesses:

FRITZ FALT, B. S. DE FOREST. 

